System for blockchain-based certificate

A system for a certificate based on a block chain, the system comprising:

• an issuer device issuing, in response to a certificate issuance request from a user terminal, a certificate including an electronic signature of an issuer to the user terminal, and storing information associated with the issuance of the certificate in an off-chain, wherein the certificate issuance request includes a first public key of a user and personal information of the user, and the information associated with the issuance of the certificate includes the first public key of the user, the personal information of the user, and a second public key of the issuer;
• and
• a service provider terminal receiving the certificate including the electronic signature of the user from the user terminal through wireless communication, and verifying the certificate through an on-chain,
• wherein at least some of the information associated with the issuance of the certificate stored in the off-chain is synchronized and stored in the on-chain.

A system for a plurality of certificates based on a block chain, the system comprising:

• at least one issuer devices each issuing, in response to respective certificate issuance requests, respective certificates including respective electronic signatures of at least one issuers to the user terminal, and storing respective information associated with the issuance of the respective certificates in respective off-chains, wherein the respective certificate issuance requests include a first public key of the user, personal information of the user, and respective second public keys of the at least one issuers;
• a user terminal providing at least some certificates among the plurality of certificates including respective electronic signatures of the user to a service provider terminal in batch through wireless communication in order to verify at least some certificates among the plurality of certificates;
• and
• a service provider terminal verifying at least some certificates among the plurality of certificates in batch through an on-chain,
• wherein at least some of the respective information associated with the issuance of the respective certificates stored in the respective off-chains are synchronized and stored in the on-chain.

A system for at least one certificates based on a block chain, the system comprising:

• at least one issuer devices each issuing, in response to respective certificate issuance requests, respective certificates including respective electronic signatures of at least one issuers to the user terminal, and storing respective information associated with the issuance of the respective certificates in respective off-chains, wherein the respective certificate issuance requests include a first public key of the user, personal information of the user, and respective second public keys of the at least one issuers;
• a user terminal transmitting, in order to entrust and store the respective first private keys of the user and the respective certificates in a trustee custodian, the respective first private keys of the user and the respective certificates to a trustee custodian device, and receiving a federation ID from the trustee custodian device in response to the transmission, and providing the federation ID to a service provider terminal through wireless communication in order to verify at least some of the at least one certificates;
• a service provider terminal transmitting a verification request for at least some of the at least one certificates by transmitting the federation ID to the trustee custodian device;
• and
• a trustee custodian device transmitting a verification approval request to the user terminal in response to the verification request from the service provider terminal, and when receiving verification approval from the user terminal, verifying at least some certificates among at least one certificates in batch through an on-chain, and transmitting a result of the batch verification,
• wherein at least some of the respective information associated with the issuance of the respective certificates stored in the respective off-chains are synchronized and stored in the on-chain.